ZN PLATED STEEL SHEET HAVING EXCELLENT SURFACE QUALITY AND DELAYED FRACTURE RESISTANCE AND METHOD FOR MANUFACTURING THE SAME

摘要

Disclosed are a zinc plated steel sheet having excellent surface quality and delayed fracture resistance and a method for manufacturing the same. According to an aspect of the present invention, a zinc plated steel sheet having excellent surface quality and delayed fracture resistance comprises a base steel sheet and a zinc plated layer formed on the base steel sheet. The base steel sheet comprises: 0.05-0.3 wt% of C; 1.0-2.0 wt% of Si; 1.5-3.5 wt% of Mn; 0.01-0.03 wt% of N; 0.05-0.2 wt% of Sn; 2-4 wt% of Al; 0.005-0.03 wt% of Ti; 0.0005-0.0030 wt% of B; 0.01-0.03 wt% of Sb; less than or equal to 0.03 wt% of P; less than or equal to 0.008 wt% of S; and the remainder consisting of Fe and inevitable impurities.